The cash price of the Superior Twin Room was £579 a night, or about a whopping $900 (CAD)! I instead opted to use my Bonvoy points, and due to the death of dynamic pricing managed to secure the stay for 190,000 Bonvoy points, plus a £90 ($150 CAD) co-payment option.
The booking process itself was straightforward, and as I usually do, I booked the three-night stay via the Marriott mobile app. JW Marriott Grosvenor House London – Booking
